I let the axis start at 1 (not 0) as a zero-thread application is kind of useless.

I increased the height to be twice the previous one as both JemallocMM and JemallocFFMM perform so badly.

The undocumented parameter suffix nonsense=something_that_ends_with.png is absolutely essential: it is ignored by the API, but used by the Markdown to HTML conversion to recognise the image type (PNG) which the API generates so the browser can use the image to get width/height information.